RE: [CAD_CAM_EDM_DRO] Re: Stepper motor speeds

Bryan,

The motors are higher voltage than ideal if your goal is high speed.
They will sure make a workable setup, just not the fastest on the block.
I agree with you that virtually all the low cost drives are limited to a
low voltage.

I am currently running 8000 steps/second on my Sherline and am far from
being at the maximum it is capable of. I tried it at 10000 steps/second
and that seemed fine, but a little much for the little machine. My
set-up at the moment is API CMD-260 drives running at 55 v with Pacific
Scientific PowerMax II motors wired in bipolar series. I don't have a
voltage on the motors, but would guess they are in the low 2 v range.

Just like with cars the question is how fast can you afford to go.
Higher voltage will do the trick, but you have to throw money at it for
drive that will run the higher voltage.

Tim
[Denver CO]

> -----Original Message-----
>
> My motors are rated for 3.2 volts at 2 amps, driven with 24
> volt choppers.
>
> Higher voltages are a problem for small, low-cost tools. The Xylotex
> drivers (3977 chip) max out at 35 volts, and the SLA7044 chip I'm
> using is similar.
>
> I'd be very interested in hearing from others who use 23 frame motors
> on small tools. What step rates are you achieving?
>
> Is anyone getting substantially more than 3300 steps per second, and
> if so, what kind of driver are you using?
>
> --
>
> Bryan Mumford
> Santa Barbara, California
> http://www.bmumford.com
>
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